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Entropy change and kinetic effects at the magnetostructural phase transition of MnBi.

Author(s) : BASSO V., OLIVETTI E. S., MARTINO L., et al.

Type of article: Article, IJR article

Summary

In this paper we investigate the entropy change and the kinetics at the magneto-structural transition (at 628 K) of polycrystalline MnBi. Samples were prepared by rapid quenching and annealing and exhibit 86 wt% of the hexagonal MnBi phase. The entropy change at the transition is found to be ?s = 17.6 J kg-1 K-1 and the magnetic field shifts the transition temperature at a rate of 2.6 K T-1. The temperature hysteresis, of 19 K, is quite large for magneto-thermal application. The transition shows kinetics effects upon cooling in which the transition temperature is found to depend approximately to the logarithm of the temperature rate with coefficient -3.8 K.

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Pages: 266-272

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Details

  • Original title: Entropy change and kinetic effects at the magnetostructural phase transition of MnBi.
  • Record ID : 30009905
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 37 - n. 1
  • Publication date: 2014/01

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